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United States Patent | 6,025,661 |
Chang | February 15, 2000 |
A stepping motor includes a rotor having a shaft and a permanent magnet securely mounted on the shaft. At least one coil wound in a plane interacts with the rotor to activate a magnetic field. An axis of magnetic field generation of the coil is perpendicular to the shaft of the rotor. The stepping motor further includes a metal housing receiving the rotor and the at least one coil. The metal housing has at least one protrusion formed on an inner face thereof to correspond to the at least one coil and attract and align the permanent magnet with the coil when the motor malfunctions.
Inventors: | Chang; Ming-Kuei (Taipei Hsien, TW) |
Assignee: | Skysys Corporation (Taipei Hsien, TW) |
Appl. No.: | 064601 |
Filed: | April 23, 1998 |
Current U.S. Class: | 310/49R; 310/42; 310/89; 310/258 |
Intern'l Class: | H02K 003/38; H02K 015/02; H02K 001/12 |
Field of Search: | 310/49 R,89,91,156,166,179,203,206,208,254,258 29/596-598 |
4071788 | Jan., 1978 | Martin et al. | 310/42. |
4319823 | Mar., 1982 | Hashimoto | 354/234. |
4818911 | Apr., 1989 | Taguchi et al. | 310/259. |
4831293 | May., 1989 | Krop | 310/49. |
5124601 | Jun., 1992 | Miyashita | 310/51. |
5686832 | Nov., 1997 | Ayres et al. | 324/146. |